Electric discharge tube



Patented Dec. 26, 1939 nunsA stares PATENT OFFICE ELECTRIC DISCHARGE TUBE Application May 14, 1937, Serial No. 142,529 In Germany May 9, 1936 2 Claims.

(Cl. Z50-27.5)

In order to obtain an efficient cooling of elecend remote from M secured in its position within tric discharge tubes it has been proposed to so construct and arrange the anode thereof that it forms part of the discharge Vessel, and to t 5k the anode with cooling fins that provide for an efficient heat emission. However, when manufacturing tubes of this kind it is extremely difiicult to attain a symmetrical arrangement of the electrode system. l0 The invention has for its object to enable such symmetrical arrangement to be in a simple manner achieved quickly and exactly.

In accordance with the invention the electrodes except the anode are mounted on an insulating body. The electrode system thus formed is then arranged within the anode and is here centered at one end with the aid of a second insulating body. Owing to this centering action the electrode system can be readily adjusted at its other end too. The electrode system is hereupon secured in its centered position by sealing the vessel, the current leads of the electrodes becoming xed thereby.

The invention will be understood from the following description, reference being had to the accompanying drawing which is a partially diagrammatic sectional view of an example of discharge tubes as provided by the invention.

In this drawing, A denotes the anode that forms part of the discharge vessel, Q designates the top or head of the vessel, and Q a flange-shaped portion thereof disposed between parts A, Q. The parts Q, Q may be of glass, for instance. Part Q has a flange q. a denotes the leads connected to the electrodes, of which the cathode K 4and a grid G are shown by way of example. Z indicates the centering body referred to, which consists of an insulating material, preferably a ceramic one. M denotes the insulating body on which the electrodes, except the anode, in the case represented cathode K and grid G, are mounted. The dimensions are such that when inserting the electrode system K, G, M into the anode A the leads a shall rest upon flange Q', as shown in the drawing, while a centering projection or stud B fitted to the electrode system, for instance to the cathode, is received in a bore of the centering body Z. The electrode system may be provided with several such projections B,

body Z then having to be furnished with as many apertures. In this way system K, G, M is at the the anode. The system is hereupon adjusted at its other end too, that is, at M. The top Q of the vesselis now placed with its flange q onto iiange Q', the leads a thus extending through betweenk these flanges, and the Well known sealing is then effected by which the parts Q and Q', A, and hence also a, M, K, G are rmly held together.

Part Q is in a well known manner provided 10 with a tubular extension where a pump is connected in order to evacuate the vessel, and which is sealed off after evacuation.

Instead of only one grid G several grids may of course be mounted on body M before the elec- 15 trode system is inserted in the vessel. Such modification may be made Without departure from the idea of the invention. Also, the proper position of the grids with respect to the cathode K may be maintained at Z by a mica disc or 20 by distance bars, beads or the like. In the case represented the centering body Z has projections C for the grid G to bear against.

Discharge tubes as provided by the invention are especially intended for very high frequencies. 25

What is claimed is:

l. An electric discharge tube comprising a potshaped anode, said anode having a shoulder formed in its inside surface, a anged annular member fastened thereto so as to form a receptacle with this anode, an apertured insulating body located in this anode and resting on said shoulder, an electrode system disposed in this receptacle having an insulating body carrying the electrodes thereof, a stud or studs projecting ,from this electrode system at the end thereof remote from the second said insulating body, such stud or studs being received in the aperture or apertures of the iirst said insulating body, a head for the said receptacle, and leads fitted to the electrode system, these leads passing through between this receptacle and head and squeezed by the two and serving the means `for centering said electrodey system with respect to said anode.

2. An arrangement according to claim 1, hav- 45 ing a grid or grids, and means fitted to the said apertured insulating body and against which such grid or grids are bearing.

ANNEMARIE KATscH. 50 

